Telephone-transmitter.



electrically with the same lead al. l have l found that this arrangement, that is, a pliirality ot distinct granular contacts in the same circuit, or the subdivision of the variable resistance conductor, and a certain positive contact therewith, produces greatly improved results in the transmission of ai'ticii ate speech, enabling greater battery power to be used, and obtaining better results with the same battery power as that now ordinarily employed, and also equally good results with less power.

By my invention it is possible to mate- L rially increase the voltage used with the transmitter and to transmit speech over a greater distance than has been possible hitherto with granular transmitters as commonly constructed with a loose gravity contact, and to obtain greater volume and clearness in the transmission over distances practicable at the present time. This invention permits an increased electrical current to pass without i causing the snapping an'd crackling or fryl ing sounds heard in the receiver, and without danger of burning the instrument. At the same time it entirely eliminates such sounds of the character referred to as are i found under the present usual conditions.

The instrument is adjusted by means` of a l screw yifivhich passes throiifrli the spring bar g into t ie disk li, whereby tlic proper normal i pressure Contact between the rigid and the granular variable resistance conductor is obtained.

1. A telephone transmitter having means for permitting the use of increased battery ower and obtaining clearer and louder efi ects in the transmission of sounds, said means comprising a variable resistance conA ductor under pressure subdivided to make a pluralitr of separated positive contacts with the transmitter diaphragm and connected in parallel in an electrical circuit with one and the same source of electrical energy.

2. In a tele hone transmitter, ii` variable resistance conductor subdivided into a plie 1 rality of parts, an elastic holder in which the subdividcdvparts of said conductor are held, a diaphraOm, means for pressing said onductor in rin, non-microp ionic contact with said diaphragm, and means' for connecting said conductor parts in circuit with a single source ol electrical energy in multiple.

8. In a telephone transmitter, a diaphragm or other vibrator, a granular variable resistance conductor subdivided into detached parts, a single pliable holder in which such parts of said conductor are held and separated from each other, a single adjusta ile spi-in -supported electrode cooperating with said t iaphragrmbetwecn whicli'and the latter said pliable holder is held, and with which all the sub-divisions of said granular conductor areV in electrical connection, and

means for forcing said electrode toward the diaphragm to press the parts of the granular conductor into firm non-miciophonic contact with the diaphra'in 4v. [n a telcpthone transi'nitter. a diapli `agn'i and its cooperative electrode, moved to and from each other variablyY b v the movements of the diaphragm, a variable resistance conductor subdivided into a pluraliti' ot separated groups ot' granules, all of which are in positive electrical connect tion with the diaphragm and its cooperative electrode, and a sinole battery, the current from which is divi ed among thc several groups ot granules.

5. In a tele ihonc transmitter, a diav phragm, an a justable elcctrode of rigid material. and a plurality7 of variable resistanees. all connected in multiplc'throiigh the diaphragm or vibrator supporting the saine to a battery with one lead, and constituting 'a variable resistance conductor which is pressed against the electrode of rigid inaterial with 'pressures varying from the nornial. by the, movements of the (,liaphragm.

ti. ln a telephone transmitter, a plurality ot' granular contacts united in multiple with one electrical lead, a compleinental adjustable electrode and a diaphragm in the same circuit, the diaphragm arranged so as to anse a varying pressure contact between said granular contacts, electrode, and dia pliragm, to vary the resistance thereof proportionate'ly to the movements ofn thc'diaphi'a in.

7. n a telephone transmitter, the coinbination with a dia )hragmr a yielding holder carried by said diaphragm and having a plurality ot distinct cups or cells, separate granulated conducting material in said cells connected up in multiple with the diaphragm, a complemental adjustable electrode in electrica contact with said conducting material, and' a battery or other source of electric energy iii circuit with said electrode.

tifln a telephone transmitter, the coinbination with a diaphragm, of a soft pad ca`rried by the diaphragm and provided with a number ot' separate pockets containing grauula r material, and a single complcmental ailjiistable electrode against which the Vinaterial in the pockets is variably pressed by the action of the diaphragm.

ttf-ilu a telephone transmitter, the combination with a dia ihragm, of a soft pad carried by the diap iragm and provided with a number ol se arate ockets containing granular materia in positive multiple electrical contact with the diaphragm, a single lead or wire, passing from the diaphragm,

a single eoniplemental adjustable electrode' against which the granular material is Varia ily pressed by the diaphra m, and a wire connected with said electro e and in the same battery circuit with the lead to the diaphragm and the granular material.

10. A telephone transmitter having in combination a diaphragm or other vibrator, a pad of soft or pliab e material having a plurality of perforations therethrough, carried or supported upon the vibrator, a variable resistance conductor disposed within the perforations in the pad, and in multiple contact with the diaphragnior vibrator, a coperative adjustable contact piece or eleci trode covering said variable resistance or` conductor and in multiple electrical contact therewith, the diaphragm or vibrator and the electrode being connected in'series with the terminals of a battery or other source of electric energy or supply.

l1. In a telephone transmitter adapted to use therewith high or low voltage currents l ranged to be agitated or vibrated by the t movements of the diaphragm when actuated by the sound waves of articulate speech or other sounds.

l2. In a telephone transmitter constructed and adapted to carry and vary high or low i voltage currents, as desired, having a variable resistance granular conductor subdivided into fractional parts, `.vi'th such tractional parts held under pressure in a suiti able receptacle having a corresponding numbei' of subdivisions, the combination of suitable contact pieces or electrodes in positive engagement with the variable resistance conductor and in connection with a single battery, one on each side of said granular conductor and in multiple electrical Contact therewith, and means for adjusting disturbi ng and vibrating the variable resistance conductor to cause electrical viliratiens or variations thereotI corresponding to the vibrations of the sound Wa ves of articulate speech and other sounds.

13. ,ln a telephone transmitter, the conibination with a casing and a mouth-piece, ot'

a diapl mouth-piece and supported so as to be free agxn immediately in rear of the to vibrate, a soft pad carried by said diaphragm having a number ot separated cells or suh-ilivisions filled with a variable resistance granular conductor, a rigid electrode in rear of said pad, a bar by whichlthe same is supported and held in firm non-micro phonic contact with' said granular oonductor, adjusting means engaged with said bar, by the operation of which the roper normal pressure contact vbetween sai rigid electrode andthe g anular conductor may he obtained, and an electric circuit having its terminals in electrical connection with the diaphragm and rigid electrode, respec- 1 tively.

il. In a telephone transmitter, the combination with a casing and a mouth-piece,

of a diaphragm immediately in rear of the` mouth-piece and supported so 'as to be free to vibrate, a soft pad carried by said diaphra m having a number of separated cells or su -divisions filled with a variable resistance granular conductor, a rigid electrode in rear ot said pad having a iacing of the saine material as said granular variable resistance conductor in direct contact With the latter, a bar by which the saine is supported and held with its facing in firm non-microphonic contact with said ranular conductor, adjusting incans engager with said bar, by the"operation of which the proper normal pressure contact between said rigid electrode and the granular conductor may be 0btained, and an electric circuit having its terminals in electrical connection with the diaphragm and rigid electrode, respectively.

l5. ln a telephone transmitter, provisions for permitting use 0f increased battery power and increasing the intensity of the sound transmitted thereby, consisting-of an electrode and a sub-divided variable resistance conductor making a lurality of separated contacts with the iiaphragni of the transmitter and with said electrode and held 

